What do you call the process wherein the energy absorbed by an electron is released and it goes back to its ground state?

What is the rate of 12 liters of water moving through a water hose in 4.0 minutes?

Water is siphoned from a large tank and discharges into the atmosphere through a 50-mm diameter tube. the end of the tube is b = 2.1 m below the tank bottom which is a = 7.4 m deep, and viscous effects are negligible. determine the maximum height h over which the water can be siphoned without cavitation occurring. atmospheric pressure is 101.4 kpa, and the water vapor pressure is 1.79 kpa (absolute)

Energy flows from the producer level to the level. is called